Heins, EvelynEvelynHeinsGrabe, JürgenJürgenGrabe2019-12-022019-12-022018Stress wave theory and testing methods for deep foundations: 1-20 (2018)http://hdl.handle.net/11420/3930An improved insight into pile driving and pile load tests, especially for tubular piles of offshore wind projects, is necessary to optimize pile installation processes and to derive reliable bearing capacities from dynamic load tests. Numerical methods are used to evaluate geotechnical processes. Challenges include the nonlinear pile-soil interaction and inelastic wave propagation in saturated soil. Numerical simulations of pile installation as well as dynamic load tests are conducted to evaluate influences from different soil and driving characteristics. Considered variations include driving frequency, drainage condition of the soil, and pile-soil interaction properties. These conducted numerical simulations based on the finite element method of pile installation show interesting results, such as pile installation time decreasing with impact frequency. Furthermore, the drainage conditions of the soil around the pile and pile-soil interaction properties significantly influence the stress waves inside the pile. A new idea of an evaluation for dynamic load tests on openended piles based on the finite element method is introduced. The unknown parameters within this approach are inversely estimated from stress wave measurements at the pile head using an evolutionary algorithm.enEvolutionary algorithmMathematical optimizationNumerical simulationOpen-ended pileOptimized pile designPile installationPile load testingConference Paper10.1520/STP161120170197Other